SQL queries, MCQs

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1. What does SQL stand for?
A. Structured Query Language
B. Sequential Query Language
C. System Query Language
D. Scripted Query Language
Answer: A

2. Which SQL command is used to retrieve data from a database?
A. GET
B. QUERY
C. SELECT
D. RETRIEVE
Answer: C

3. What does the SQL keyword “DISTINCT” do in a SELECT statement?
A. Retrieves all rows from a table
B. Retrieves only unique values for a specified column
C. Retrieves the first row from a table
D. Retrieves rows based on a condition
Answer: B

4. Which SQL clause is used to filter rows based on a specified condition?
A. WHERE
B. FILTER
C. CONDITION
D. LIMIT
Answer: A

5. What does the SQL keyword “ORDER BY” do?
A. Groups rows that have the same values into summary rows
B. Orders rows in ascending or descending order based on a specified column
C. Joins rows from two or more tables based on a related column
D. Deletes rows from a table
Answer: B

6. Which SQL command is used to insert new data into a table?
A. ADD
B. INSERT
C. CREATE
D. UPDATE
Answer: B

7. What does the SQL keyword “GROUP BY” do?
A. Orders rows in a specified column
B. Filters rows based on a condition
C. Groups rows that have the same values into summary rows
D. Joins rows from two or more tables based on a related column
Answer: C

8. Which SQL command is used to update existing data in a table?
A. UPDATE
B. MODIFY
C. CHANGE
D. ALTER
Answer: A

9. What is the purpose of the SQL keyword “HAVING”?
A. To filter rows based on a condition
B. To order rows in ascending or descending order
C. To specify conditions for groups created by GROUP BY
D. To join rows from two or more tables
Answer: C

10. Which SQL command is used to delete specific rows from a table?
A. DELETE
B. REMOVE
C. DROP
D. ERASE
Answer: A

11. What does the SQL keyword “LIKE” do?
A. Matches exact values in a column
B. Matches values that are not in a specified list
C. Matches patterns in text data
D. Matches values greater than or equal to a specified value
Answer: C

12. Which SQL command is used to create a new table?
A. MAKE TABLE
B. CREATE TABLE
C. DEFINE TABLE
D. ADD TABLE
Answer: B

13. What does the SQL keyword “JOIN” do?
A. Deletes rows from a table
B. Orders rows in ascending or descending order
C. Combines rows from two or more tables based on a related column
D. Retrieves rows based on a condition
Answer: C

14. Which SQL command is used to add a new column to an existing table?
A. ADD COLUMN
B. INSERT COLUMN
C. CREATE COLUMN
D. DEFINE COLUMN
Answer: A

15. What does the SQL keyword “NULL” represent?
A. A value of zero
B. An empty string
C. A missing or unknown value
D. A wildcard character
Answer: C

16. Which SQL command is used to remove a table from a database?
A. REMOVE TABLE
B. DELETE TABLE
C. DROP TABLE
D. ERASE TABLE
Answer: C

17. What is the purpose of the SQL keyword “UNION”?
A. To combine the results of two or more SELECT statements
B. To order rows in ascending or descending order
C. To filter rows based on a condition
D. To join rows from two or more tables
Answer: A

18. Which SQL command is used to rename an existing table?
A. ALTER TABLE
B. RENAME TABLE
C. UPDATE TABLE
D. CHANGE TABLE
Answer: B

19. What does the SQL keyword “AS” do in a SELECT statement?
A. Specifies a condition for filtering rows
B. Renames a column or table
C. Orders rows in ascending or descending order
D. Specifies an alias for a column or table
Answer: D

20. Which SQL command is used to create a unique constraint on a column?
A. ADD CONSTRAINT UNIQUE
B. ADD UNIQUE
C. UNIQUE CONSTRAINT
D. CREATE UNIQUE
Answer: A

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